Synthetic resin film covered heat insulating/sound absorbing material of inorganic fibers and a method of producing the same

Abstract

A heat insulating/sound absorbing material wherein the entire surface of an inorganic fiber mat is covered with a synthetic resin film or films and a method of producing the same. Front and rear surfaces of an inorganic fiber mat 12 as well as both side surfaces along a longer side thereof are covered with synthetic resin films 13, 14 ; both ends of the synthetic resin films in the direction of a longer side of the inorganic fiber mat 12 are extended from both ends in the direction of a shorter side thereof to thereby cover both end surfaces in the direction of a shorter side of the inorganic fiber mat 12 ; an adhesive is applied continuously or discontinuously along the direction of a longer side of film to a portion in the direction of a shorter side of the inorganic fiber mat whereby the inorganic fiber mat and the synthetic resin films, and a mutually opposing portion of the synthetic resin films are bonded so as to make air communicate through unbonded portions.

What is claimed is:  
     
       1. A synthetic resin film covered heat insulating/sound absorbing material of inorganic fibers which comprises: 
       an inorganic fiber mat, having longer and shorter sides and two synthetic resin films which cover front and rear surfaces and both side surfaces along the direction of the longer side of the inorganic fiber mat, wherein the synthetic resin film at the front side and the synthetic resin film at the rear side, along the direction of the longer side of the mat, respectively have extensions which extend by 10 mm to 200 mm from both sides along the direction of the shorter side of the inorganic fiber mat, transverse to the direction of the longer side of the mat, and which are bonded with a hot melt adhesive at mutually opposing portions so that both end surfaces along the shorter side of the inorganic fiber mat are covered with the synthetic resin films, and the inorganic fiber mat is bonded to one of the synthetic resin films and the synthetic resin films are mutually bonded in a discontinuous manner in the direction of the shorter side of the inorganic fiber mat so that air communicates through unbonded portions of the synthetic resin films, and further extensions extending from both sides along the direction of the longer sides of the inorganic fiber mat.  
     
     
       2. The heat insulating/sound absorbing material according to  claim 1 , wherein the synthetic resin films are bonded in a discontinuous manner along the direction of a longer side of the inorganic fiber mat so that air communicates through unbonded portions of the synthetic resin films. 
     
     
       3. The heat insulating/sound absorbing material according to  claim 1 , wherein each of the extensions of the synthetic resin films extended from both sides along the direction of the longer side of the inorganic fiber mat is 10 mm to 100 mm. 
     
     
       4. The synthetic resin film covered heat insulating/sound absorbing material of  claim 1 , wherein said hot melt adhesive is a sticking hot melt adhesive.